Job Description Overview We’re looking for a skilled and safety-focused Water Mains Chlorination & Commissioning Technician to join our Network Improvement team. In this role, you’ll be responsible for the safe, efficient, and compliant chlorination, pressure testing, and commissioning of newly installed water mains and services. You’ll play a vital part in protecting water quality, ensuring network integrity, and supporting the smooth handover of completed assets in accordance with Northumbrian Water (NWG) standards, industry regulations, and United Infrastructure operating procedures. Key Responsibilities Chlorination & Disinfection Carry out chlorination of new and repaired water mains using approved methods. Calculate chlorine doses, volumes, retention times, and neutralisation requirements. Safely neutralise and dispose of chlorinated water using approved de-chlorination equipment and chemicals. Collect water samples post-chlorination for laboratory analysis and maintain accurate test data. Pressure Testing Conduct hydrostatic pressure tests on mains and services using calibrated equipment. Verify pressures, durations, and allowable drops in line with standards. Identify and report leaks or integrity issues promptly. Complete all logs, paperwork, and digital records for test certification. Water Quality Compliance Adhere to NWG protocols and United Infrastructure operating procedures. Maintain high standards of hygiene, pipe cleanliness, and contamination control. Support site teams in proper pipe storage, capping, and protection. Documentation & Reporting Complete chlorination certificates, sampling logs, and pressure test results. Submit documentation to planners, commissioning engineers, and NWG representatives. Maintain accurate records for audit and compliance purposes. Equipment Management Operate, maintain, and calibrate chlorination rigs, pumps, and testing equipment. Inspect hoses, connections, and backflow prevention devices for compliance. Report defects and ensure all equipment remains certified and safe. Health, Safety & Environmental Follow NWG and United Infrastructure safety standards, including Zero Harm principles. Carry out risk assessments and comply with COSHH, PUWER, and HSG47 regulations. Handle and store chemicals safely, preventing environmental harm through proper wastewater management.